The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2006
Filed:
Jul. 12, 2002
Yoshihisa Suzuki, Itinomiya, JP;
Sayoko Tanaka, Gifu, JP;
Hiroaki Izumi, Hirakata, JP;
Sinji Kobayashi, Gifu, JP;
Yoshihisa Suzuki, Itinomiya, JP;
Sayoko Tanaka, Gifu, JP;
Hiroaki Izumi, Hirakata, JP;
Sinji Kobayashi, Gifu, JP;
Sanyo Electric Corp., Ltd., Moriguchi, JP;
Abstract
A disk medium, an information recording device, and an information reproducing device are provided, which are capable of efficiently recording sub-information such as security data and, if the sub-information is set as the security information, enhancing a security performance. The disk is divided into a plurality of zones in radial directions. A logical zone count in each zone is obtained by dividing a total recordable frame count in each zone by a frame count in a unit logical zone. For example, a logical zone count N1z in a zone i is given by:11where Fzi is the total frame count in the zone i, and F1z is a frame count in the logical zone. However, a value given by the formula (1) is not always an integer depending on the zone, and there might exist a frame (gap region) not used for the logical zone. Accordingly, the security data are recorded in this gap region.